Crane boom having a hinged section



p 21, 1954 D. F. PRZYBYLSK! 2,689,656

CRANE BOOM HAVING A HINGED SECTION Filed Jan. 16, 1953 3 Sheets-Sheet lgay Q fi omgg P 21, 1954 D. F. PRZYBYLSKI 2,689,656

CRANE BOOM HAVING A HINGED SECTION Q "a 3; vi"

INVENTOR.

Sept. 21, 1954 D. F. PRZYBYLSKI CRANE BOOM HAVING A HINGED SECTION 3Sheets-Sheet 5 Filed Jan. 16, 1953 I N V EN TOR a/i/e/ @i M g /5x;

Patented Sept. 21, 1954 UNITED STATES PATENT ()FFICE 2,689,656 CRANEBOOM HAVING A HINGED SECTION Daniel F. Przybylski, Winona, Minn.Application January 16, 1953, Serial No. 331,586

6 Claims. :1

My present invention relates to improvements in cranes having a swingingboom.

An object of this invention is to provide a novel swinging boomstructure for a crane.

Another object is to provide anovel swinging boom structure for a cranehaving a hinged section.

Still another object is to provide a novel swing- Ing boom structure fora crane and a hydraulically-operated ram for raising or lowering thesame.

A further object is to provide a novel swinging boom structure for acrane having a hoisting cable and hydraulic means for operating thesame. i

A still further object is to provide a strut for a, swinging crane boomhaving a hinged section.

These and other objects of the invention will be apparent from thefollowing description, reference being had to the drawings.

To the above end, generally stated, the invention consists of the noveldevices and combination of devices hereinafter described and defined inthe claims.

In the accompanying drawings, which illustrate the invention, likecharacters indicate like parts throughout the several views.

Referring to the drawings:

Fig. 1 is a side elevational view of the invention with the upperportion thereof removed on the line A-A and shown in an offset position,said view also showing a fragment of the rear end portion of amotor-propelled truck on which is mounted a novel truck mount for thecrane;

Fig. 21s a fragmentary side elevational view of the intermediate portionof the crane, on an enlarged scale;

Fig. 3 is a plan view of the parts shown in Fig. 2, except somewhat morefragmentary;

Figs. 4, 5, 6 and 7 are fragmentary detail views principally in sectiontaken on the lines 4-4, 55, 65 and 11 of Fig. 2, respectively, on anenlarged scale;

Fig. 8 is a view partly in plan and partly in horizontal section takenon the line B-8 of Fig. 2, on an enlarged scale;

Fig. 9 is a fragmentary detail view partly in side elevation and partlyin vertical section taken on the line 3-9 of Fig. 3, on the same scaleas Fig. 8;

Figs. 10 and 11 are views partly in elevation and partly in sectiontaken on the lines Ill-l0 and ll-ll of Fig. 9, respectively;

Fig. 12 is a detail view partly in elevation and partly in section takenon the line l2-|2 of Fig. 2, on the same scale as Fig. 4; l

Fig. 13 is a view partly in plan and partly in horizontal section takenon the line: l3-l3 of Fig. 2, on the same scale as Fig. 12; and

Fig. 1.4 is a plan view of the parts, at the line |4-l4, of Fig. 2, onthe same scale as Fig. 13.

The numeral l5 indicates a fragment of the rear end portion of amotor-propelled truck on which is mounted a novel truck mount 16 whichis the subject matter of a pending application filed January 16, 1953under Serial Number 331,584 and entitled, Truck Mount for Booms, Cranes,and the like.

This truck mount [6 includes a sub-frame I1 and an upright main framel8. Forming a part of the truck mount 16 is a turn post I 9 mounted on astep bearing 20 and turnable in .a sleeve bearing 2|. These bearings2ll--2l are fixed to the main frame [8. On the lower end portion of theturn post [9 is a large sheave 22 having a grooved periphery for a cableoperated by hydraulic rams, not shown. A pair of laterally spaced lowerears 23, fixed to the turn post 19 and sheave 22, project radially fromsaid turn post. Fixed to the turn post [9 and the ears 23 is areinforced upright web 24 having on its upper end a pair of laterallyspaced upper ears 25 that overlie the ears 23.

The numeral 26 indicates a novel offset tubular boom, which, in part, isthe subject matter of a pending application filed January 16, 1953 underSerial Number 331,584 and entitled, Truck Mount for Booms, Cranes, andthe like. The boom 26, at its inner end portion extends between the ears23 and is pivoted thereto for raising and lowering movements. Ahydraulic ram 21 overlying the boom 26 is lowering said boom andincludes a cylinder 28 and a piston 29 having a piston rod 39. Thecylinder 28, at its rear end, is attached to the upper cars 25 by auniversal coupling 28'. The piston rod 30, at its outer end portionextends between a pair of laterally spaced upstanding ears 3|, fixed tothe boom 26 at its outer end portion, and is pivoted thereto.

The boom 26 has a long extension comprising an inner section 32 and ahinged outer section 33. The section 32 is formed of two channel bars 34 arranged with flanges extending horizontally outwardly. These channelbars 34 are laterally spaced parallel and connected, near their rearends, by a crosstie angle bar 35. The outer section 33 is also formed oftwo channel bars 36 arranged in the same manner as the channel bars 34.The channel bars 36 of the section 33 are in outwardly convergingrelation with their inner ends aligned with the channel bars 34.

provided for raising and 29 in the channel bars Sii.

The two sections 32-33 are connected by a pair of laterally spacedhinges 37 secured, one pair to each pair of aligned channel bars 34-36.The section 32 extends longitudinally under the boom 25 from its rearend substantially at its point of offset. At this point, the boom 36 isprovided, at its under side, with a fixed pair of laterally spaceddepending ears 38. A pair of laterally spaced depending side plates 39,between which the cars 38 extend, are rigidly secured, one to eachchannel bar 34. A pin as extends through aligned holes in the ears 38and side plates 69 and connects the section 32, at its rear end to theboom 25, see Figs. 2 and 4. The section 32 is further connected to theboom 26 by a pair of upstanding ears M fixed to the channel bars 3%, attheir inner faces, and between said ears the boom 26 projects. A pin 42extends through aligned holes in the cars It! and the boom 26 andconnects said ears to the boom 28, Figs. 2 and 7.

The section 32 is still further attached to the boom 26 by two pairs ofupright ears "53 secured to the flanges or" the channel bars 3% at theirouter longitudinal edges, see Figs. 2 and 5. The boom 25, between theears d3 of each pair, is provided on its sides with a pair of longbosses 413. These bosses 4 engage the ears 53 on their inner sides andare secured thereto by screws iii that extend through holes in said earsand have threaded engagement with the bosses n, see Fig. 5.

The hinges 3! are below the channel bars 34-35 and each comprises a pairof flat members t and ll on the sections 32-33, respectively. The hingemembers ll are rectangular and elongated transversely of the channelbars 38 with their upper end portions fitted in deep notches 48 in theflanges oi the bars 35 next to the webs of said bars and rigidly securedthereto. The hinge members t? are each in the form of an L with theirupper portions fitted in rabbets The lower portions or" the hingemembers 45 overlap the hinge members H on their inner sides. A hinge pin'55 extends through aligned holes in the hinge memhers 33 and ll andconnects said members whereby the upper section 33 may be folded underthe section 32, as shown by broken lines in Fig. l.

The sections 32-33 are releasably connected with the section (33 alignedwith section 32, by a two-part upstanding strut 5i including a pair ofparallel flat plates 52 and 53 that extend transversely between theadjacent end oi the sections 32-33. The channel bars E l-36 at theirends abut the plates 52-53, respectively, at their lower end portionsand are rigidly secured thereto, Figs. 2, 9, and 11. The plates 52-53are each reinforced by a pair of gussets 54 and 55, respectively. Thegussets 54-55 rest on the upper flanges of the channel bars S-tt,respectively, at their outer longitudinal edge and extend to the tops ofthe plates 52-53.

Fixed to the face of the plate 52 are upper and lower pairs of bosses 5Bwhich are engaged by the plate 53 and act as spacers to position theplate 53 parallel to the plate Nut-equipped bolts 5'! extend throughaligned holes in the plates 52-53 and the bosses 55 and hold the platesclamped onto said bosses.

Truss rods 55 and 59 extend, one longitudinally over each channel bar til-36, respectively, with one of their end portions extending throughholes in the upper portions of the plates 52-53, respectively, and areupset to provide heads 50 that attach the truss rods 58-59 to the plates52-53. The truss rods 58-58, at their other end portion extend, theformer through holes in upright anchor plates 6| and the latter extendthrough holes in a single anchor plate 62. The anchor plates 6| arerigidly secured one to each of the upper flanges, the channel bars 3 5and reinforced by a pair of gussets 63. The anchor plate 62 abuts theouter ends of the channel bars 3%, is rigidly secured thereto andaffords a crosstie for said channel bars. Nuts 6 are applied to thetruss rods 58-59 and impinge the anchor plates til-62 as bases ofresistance and hold the truss rod under tension.

A hoisting cable 85 runs over a sheave t5 journaled to and between apair of ears Bl secured to the channel bars 36, at their outer endportions, and depending therefrom. The ears bl, above the sheave 85, arecross-connected by a nutequipped bolt 68. ,A hook 69 is attached to thecable 65 at its outer end, and said cable at its other end is loopedaround the transverse portion of a clevis 1i] attached to a sheave lock1 l. The intermediate portion of the cable 65 is looped around andarranged to run over two multiple sheaves l2 and '13. The sheaves T2 arejournaled to and between the hinge members "it to turn about a commonaxis, and the sheaves is are journaled in the block ll to turn about acommon axis, see Figs. 1, 2, 3, 9, 12, 13 and 14.

The hinge members 46 are cross connected, both above and below thesheaves 52, by nutequipped bolts M. The side members of the clevis 1Gembrace the sheave block. "H and the journal E5 of the sheaves 73extends through aligned holes in said side member and attach the clevisit to the sheave block l l. The clevis "it is further attached to thesheave block "H by a nute uipped bolt '15 that extends through alignedholes in the side members of the sheave block H and the clevis it. Apair of nut-equipped bolts ll cross-connect the side members of thesheave block ll above and below the sheaves F3.

The sheave block ii is pulled by a hydraulic ram 18 to lift the end ofthe cable 65 provided with the hook 69 or pushed to put slack in saidcable, whereby the hook-equipped end of the cable 65 may be lowered.This ram '58 underlies the boom extension 32 and comprises a cylinder 19and a piston having a piston rod 8i. The cylinder 79, at its outer end,is connected to the side plates 39 by a universal coupling 82 andsupported at its outer end portion by a sleeve bearing 83. This bearing83 includes a lower section 84 and an upper section 35 having outturnedend portions 86 connected by nut-equipped bolts 31 that clamp thebearing 83 into the cylinder 89. The bearing section is rigidlyconnected by a vertically edgewise positioned bar 88 that extendstransversely between the channel bars 3%, is rigidly secured thereto andacts as a cross-tie for said channel bars. The cross-tie bar 83 isreinforced by gussets 89. The channel bars 36 are further connected by across-tie bar Q5} placed flatwise against the ears 5! and between saidchannel bars and rigidly secured to said bars and ears, Figs. 2 and 3.

The cylinders 28-79 are provided with fittings 9| and 92, respectively,through which fluid under pressure is introduced into said cylinders foroperating their pistons through hose connections, not shown, leadingfrom a source of fluid supply, under pressure, through handcontrolledvalves.

While there are herein disclosed but a limited number of embodiments ofthe structure, process and product of the invention herein presented, itis possible to produce still other embodiments without departing fromthe inventive concept herein disclosed, and it is desired therefore thatonly such limitations be imposed on the appended claims as are statedherein, or required by the prior art.

What I claim is:

1. In an assembly of the class described, a turn post, a boom includingan inner section and an outer section, the former being pivoted to theturn post for raising and lowering movements, a hinge joint connectingthe outer section to the inner section for folding movement thereon, astrut at the hinge joint comprising two upright parts rigidly securedone to each of said sections, at least one truss rod connecting eachpart of the strut to the respective section, means releasably connectingsaid two parts for holding the outer section in a fixed operativeposition relative to the inner section, and a hydraulic ram connectingthe inner section to the turn post and operable to raise or lower saidinner section.

2. The structure defined in claim 1 in which the hinge joint includes apair of laterally spaced hinges, each comprising a pair of dependingoverlapped plates rigidly secured one to each of the sections, and ahinge pin extending through aligned holes in the overlapped hingeplates, said hinge joint, when the outer section is in an operativeposition, holding the two sections endwise spaced apart, the parts ofthe strut being two flat upright plates extending transversely betweenthe adjacent ends of the two sections and in abutting engagement onewith each of said sections, the means releasably connecting the twoparts of the strut being nut-equipped bolts that extend through alignedholes in the two plates.

3. The structure defined in claim 1 in which the hinge joint includes apair of laterally spaced hinges, each comprising a pair of dependingoverlapped plates rigidly secured one to each of the sections, and ahinge pin extending through aligned holes in the overlapped hingeplates, said hinge joint, when the outer section is in an operativeposition, holding the two sections endwise spaced apart, the parts ofthe strut being two flat upright plates extending transversely betweenthe adjacent ends of the two sections and in abutting engagement onewith each of said sections, the means releasably connecting the twoparts of the strut being nut-equipped bolts that extend through alignedholes in the two plates, said structure further including spacing bossesbetween the two strut plates.

4. The structure defined in claim 1 in which the hinge joint includes apair of laterally spaced hinges, each comprising a pair of dependingoverlapped plates rigidly secured one to each of the sections, and ahinge pin extending through aligned holes in the overlapped hingeplates, said hinge joint, when the outer section is in an operativeposition, holding the two sections endwise spaced apart, the parts ofthe strut being two fiat upright plates extending transversely betweenthe adjacent ends of the two sections and in abutting engagement onewith each of said sections, the means releasably connecting the twoparts of the strut being nut-equipped bolts that extend through alignedholes in the two plates,

, ping the outer said structure further including tubular bosses betweenthe two plates, integral with one of said plates through which the boltsextend.

5. The structure defined in claim 1 in which the hinge joint includes apair of laterally spaced hinges, each comprising a pair of dependingoverlapped plates rigidly secured one to each of the sections, and ahinge pin extending through aligned holes in the overlapped hingeplates, said hinge joint when the outer section is in an operativeposition, holding the two sections endwise spaced apart, the parts ofthe strut being two fiat upright plates extending transversely betweenthe adjacent ends of the two sections and in abutting engagement onewith each of said sections, the means releasably connecting the twoparts of the strut being nut-equipped bolts that extend through alignedholes in the two plates, said structure further including gussetsreinforcing the strut plates.

6. In an assembly of the class described, a turn post, a boom pivoted tothe turn post for raising or lowering movements, a hydraulic ramconnecting the boom to the turn-post and operable to raise or lower theboom, an extension for the boom including an inner section and an outersection, each section comprising a pair of laterally spaced chamlel barsarranged with their webs in opposing relation and their flangesextending outwardly, means cross-connecting the channel bars of eachsection, the inner section underlapportion of the boom and rigidlysecured thereto, a hinge joint connecting the outer section at its innerend, to the inner section at its outer end for folding movementthereunder, and releasable means connecting the outer section to theinner section at the hinge joint in a relatively fixed position, thereleasable means that connects the two sections being a strut comprisingtwo plates that extend transversely between the adjacent end of the twosections, perpendicular thereto, and in abutting engagement each withthe channel bars of one of the sections and rigidly secured thereto, andnut-equipped bolts connecting the strut plates, said structure furtherincluding an anchor fixed to each channel bar of the inner section, apair of truss rods attached at one of their ends to the strut plate ofthe inner section and attached at their outer ends, one to each anchor,an anchor connecting the channel bars of their outer section at theirouter ends, and a second pair of truss rods attached at one of theirends to the strut plate of the outer section, and attached at theirother ends to the last noted anchor.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,458,739 Weber June 12, 1923 2,383,172 Wagner et a1 Aug. 21,1945 2,437,466 Hail Mar. 9, 1948 2,489,326 Rockstrom et al. Nov. 29,1949 2,529,454 Marcantonio Nov. 7, 1950 FOREIGN PATENTS Number CountryDate 16,939 Great Britain Dec. 27, 1884 788,543 France July 29, 1935

